2.0 Analysis 2.1 General This accident can be described as a non-associated midair collision.(7) This means that the pilots involved were not intentionally flying in close proximity as they would if they had been involved in a formation flight. Given the circumstances of this accident, it is likely that, although each pilot was probably generally aware of the otherthrough radio communicationsneither one was specifically aware of the location of the other aircraft. During the investigation into this accident, no mechanical defect with either aircraft was found, nor was there any indication of pre-existing disease or conditions likely to have led to the pre-impact incapacitation or impairment of either pilot. To address the issues of why these two aircraft were in each other's vicinity without knowing the other was there, this analysis will examine airport traffic circuits, circuit-joining procedures, communication procedures, and the see-and-be-seen principle. Rules and procedures that address right-of-way issues are not discussed in this report because they cannot be applied to non-associated collisions; that is, one cannot be expected to give way to another if one is not aware of the other. Weather is not considered a contributing factor in this accident. 2.2 Circuit Procedures and Communications Procedures 2.2.1 Mooney M20C